Need to replace graphics processor in vintage MacBook Pro 17". Nvidia died when installed Maverick.

Is it   reasonable to  replace the NVidia graphics processor in MacBook Pro? Apple program to fix is long over with and its considered vintage.

Your frustration is very understandable. It sounds like a hardware issue of some sort. The AHT does not test everything, so it will not necessarily find every possible hardware issue. Apple has a more sophisticated hardware test they can run, and often hardware issues may not show up until the machine is heated up. What they probably want to do is to try to reproduce the freeze and then run the test to see what is wrong.
You can run the cleanest system possible, and still be beset by a hardware problem, which can only be solved by replacing the faulty parts. Here's hoping that the Apple guys can discover what is wrong and fix it for you.
Hardware problems can be intermittent and hard to find. If they can't make it freeze and therefore don't find anything, then the next step would be to use it at the Apple Store until it freezes up and then give it to them to evaluate.
Good luck!

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